Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=52587 Ensure that if it is necessary to fall back to the default NullRealm, the NullRealm instance is created early enough for it to be correctly initialised.
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=52587
Ensure that if it is necessary to fall back to the default NullRealm,
the NullRealm instance is created early enough for it to be
correctly initialised.

git-svn-id: 79cef5a5a257cc9dbe40a45ac190115b4780e2d0@1240795 13f79535-47bb-0310-9956-ffa450edef68

Nickname0806/Test_Q4,Nickname0806/Test_Q4,apache/tomcat,apache/tomcat,Nickname0806/Test_Q4,apache/tomcat,Nickname0806/Test_Q4,apache/tomcat,apache/tomcat